Paint, lithographic varnish, printing ink, and the like and process of making same



ENT OFFICE,

PAINT, rr'rnoonarnro VARNISH, PRINTING INK, AND THE LIKE AND PROCESS OFNo SAME Wilfred Graham Dewsbury, London, and Arnold Davies, WestNorwood, London, England No Drawing. Application October 29, 1934,Serial No. 750,590. In Great Britain October 18, 1934 7 Claims. (Cl.134-39) This invention relates to paints, lithographic suspension ofgraphite and the product is emvarnishes, printing inks and the like, andprocployed as a final vehicle for the production of ess of making same.lithographic varnishes.

It is an object of this invention to provide Alithographic varnish isproduced for instance paints, lithographic varnishes, printing inks andby incorporating with the said vehicle 50% of its 5 the like which arecharacterized by improved weight or a stamped bronze powder such asalufiuidity at a rate of shear characteristic of pracminium and bronzesknown in the trade for tical painting or printing, with increasedlevelling the production of so-called gold and silver inks. properties.What we claim is:

10 It is a further object of this invention to 1. Process for themanufacture of paints, lith- 10 provide lithographic varnishes, inparticular for ographic varnishes, printing inks and the like bronzeprinting, in the use of which the bronzes comprising heating apolymerized vegetable dryform in an improved manner an apparently coningoil to about 130 C. with about 2-5% of a tinuous brilliant film over theentire free surface. substance of the group comprising glue, gelatineThe process in accordance with this invention and isinglass until a massof fibres has separated, 15 comprises several stages. The first stageconisolating the liquid product, adding about 0.5% sists in theproduction of a dispersion of the and not more than about 1% of finelydivided hydrophobic phase of a substance of the group graphite thereto,milling the mixture until the comprising glue and gelatine in an oilbase suitgraphite has been brought to colloidal dimensions able for themanufacture of the said paints, varand incorporating a pigment with thevehicle nishes and inks. This is carried out by the treatthus produced.ment of a glue, gelatine or isinglass, in the pro- 2. Process accordingto claim 1 in which a portion of about 2-5%, with such an oil base atpowder of the type termed bronze powders is ema temperature of about 130C. until a mass of ployed as pigment.

fibres separates and the isolation of the liquid 3. Process for themanufacture of paints, lith- 25 product from the residue. In thisprocess polyographic varnishes, printing inks and the like merizedvegetable oils of the drying type, such as comprising heating a vehicletherefor to about linseed, tung and perilla oils, can be used and 130 C.with a substance of the type of glue until in general customary vehiclesfor the production a mass of fibres has separated, isolating the liqofthe required final products so long as they boil uid product, addingabout 0.5% and not more 30 above 130 C. than about 1% of finely dividedgraphite there- In a further stage the dispersion thus produced to,milling the mixture until the graphite has is mixed with finely dividedgraphite in a probeen brought to colloidal dimensions and inportion ofthe order of 0.5%, but in any case not corporating a pigment with thevehicle thus promore than about 1% of graphite, and the graphite duced.35 is reduced to colloidal dimensions by grinding in 4. Process for themanufacture of a vehicle suitable mills. The product as such or afterfor incorporation into paints, lithographic varmixing with a furtherquantity of polymerized nishes, printing inks and the like, comprisingvegetable drying oils provides a vehicle for the heating a vegetabledrying oil to about 130 C.

production of the improved products. with a substance of the groupcomprising glue,

The addition of graphite in such a proportion gelatine and isinglassuntil a mass of fibres has as set out above causes no apparentalteration separated, isolating the liquid product, adding in the colourof paints, varnishes and of those about 0.5% and not more than about 1%of containing bright coloured pigments. finely divided graphite theretoand milling the The following example illustrates the invenmixture untilthe graphite has been brought to 45 tion: colloidal dimensions.

A polymerized linseed oil, having an iodine 5. Process for themanufacture ofso-called gold value within the limits customarilyspecified for and silver lithographic varnishes and printinglithographic inks, is heated to 130 C. with 25% inks, comprising heatingpolymerized linseed oil by weight of glue, gelatine or isinglass,preferto about 130 C. with 2-5% of a substance of the ably in thinsheets, until a mass of tangled fibres type or glue until a mass offibres has separated, h p e e l qu p d s s p rated isolating the liquidproduct, adding about 0.5% from the fibres and to it is added 0.5% offinely and not more than about 1% of finely divided divided graphite.The product is milled in the graphite thereto, milling the mixture untilthe customary manner in order to produce a colloidal graphite has beenbrought to colloidal dimensions 55 and incorporating with the vehiclethus produced a metal bronze powder.

6. A vehicle for paints, lithographic varnishes and printing inkscomprising a polymerized vegetable oil having dispersed therein thehydrophobic phase of a substance of the type of glue and having incolloidal suspension about 0.5% and not more than about 1% of graphite.

'7. Paints, lithographic varnishes and printing inks comprising apolymerized vegetable oil having dispersed therein the hydrophobic phaseof a substance of the type of glue, having in colloidal suspension about0.5% and not more than about 1% of graphite and being incorporated witha pigment.

WILFRED GRAHAM DEWSBURY.

ARNOLD DAVIES.

